A218577 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 1 | | 3 | | 1 |
| | | | | | | | 1 | | 7 | | 6 | | 1 |
| | | | | | | 1 | | 15 | | 25 | | 11 | | 1 |
| | | | | | 1 | | 31 | | 90 | | 74 | | 20 | | 1 |
| | | | | 1 | | 63 | | 301 | | 402 | | 209 | | 37 | | 1 |
| | | | 1 | | 127 | | 966 | | 1951 | | 1629 | | 590 | | 70 | | 1 |
| | | 1 | | 255 | | 3025 | | 8869 | | 10839 | | 6430 | | 1685 | | 135 | | 1 |
| | 1 | | 511 | | 9330 | | 38720 | | 65720 | | 56878 | | 25313 | | 4870 | | 264 | | 1 |
|
A218577 as a square array
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 3 | 7 | 15 | 31 | 63 | 127 | 255 | 511
| | 1 | 6 | 25 | 90 | 301 | 966 | 3025 | 9330
| | 1 | 11 | 74 | 402 | 1951 | 8869 | 38720
| | 1 | 20 | 209 | 1629 | 10839 | 65720
| | 1 | 37 | 590 | 6430 | 56878
| | 1 | 70 | 1685 | 25313
| | 1 | 135 | 4870
| | 1 | 264
| | 1
|
A218577 as an upper right triangle
| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1
| | 1 | 3 | 7 | 15 | 31 | 63 | 127 | 255 | 511
| | | 1 | 6 | 25 | 90 | 301 | 966 | 3025 | 9330
| | | | 1 | 11 | 74 | 402 | 1951 | 8869 | 38720
| | | | | 1 | 20 | 209 | 1629 | 10839 | 65720
| | | | | | 1 | 37 | 590 | 6430 | 56878
| | | | | | | 1 | 70 | 1685 | 25313
| | | | | | | | 1 | 135 | 4870
| | | | | | | | | 1 | 264
| | | | | | | | | | 1
|
|
